1)That telling a murderer he'll go to jail for carrying a gun will make him think twice.
2)That most people are seething cauldrons of potential violence who cannot be trusted with a gun, but most people are so decent that there is no need to carry a weapon for defense.
3)That a trauma surgeon's experience in treating gunshot wounds makes him an expert on gun control legislation, just like an automobile body repair technician's experience repairing cars makes him an expert on traffic laws.
4)That if an a group of anti-gun protesters feels threatened, they should ask police with guns to protect them while they tell everyone how worthless guns are for protection.